Transmission apparatus and method, and reception apparatus and method

1. A transmission apparatus comprising:

a signal processing circuit configured to:

obtain information data bits to be transmitted;

add known information data bits to the information data bits to generate first data blocks;

perform error-correction coding on the first data blocks to generate first coded data blocks including parity data blocks such that the first coded data blocks satisfy a first code rate;

remove the known information data bits from the first coded data blocks to generate second coded data blocks, the second coded data blocks satisfying a second code rate different from the first code rate; and

modulate the second coded data blocks using a modulation scheme to generate a modulated signal; and

a transmitter configured to transmit the modulated signal, wherein

a number of the known information data bits depends on a number of the information data bits such that the first code rate is fixed regardless of the number of the information data bits.

2. The transmission apparatus according to claim 1 , wherein the known information data bits are zeroed bits.

3. A transmission method comprising:

obtaining information data bits to be transmitted;

adding, by a signal processing circuit, known information data bits to the information data bits to generate first data blocks;

error-correction coding, by the signal processing circuit, the first data blocks to generate first coded data blocks including parity data blocks such that the first coded data blocks satisfy a first code rate;

removing, by the signal processing circuit, the known information data bits from the first coded data blocks to generate second coded data blocks, the second coded data blocks satisfying a second code rate different from the first code rate;

modulating, by the signal processing circuit, the second coded data blocks using a modulation scheme to generate a modulated signal, and;

transmitting, from an antenna, the modulated signal, wherein

a number of the known information data bits depends on a number of the information data bits such that the first code rate is fixed regardless of the number of the information data bits.

4. The transmission method according to claim 3 , wherein the known information data bits are zeroed bits.

5. A reception method comprising:

receiving a modulated signal from a transmission apparatus;

demodulating the modulated signal to generate second coded data blocks; and

error-correction decoding the second coded data blocks,

wherein the modulated signal has been generated by the transmission apparatus performing an encoding process, the encoding process including:

adding known information data bits to information data bits to generate first data blocks;

error-correction coding the first data blocks to generate first coded data blocks including parity data blocks such that the first coded data blocks satisfy a first code rate;

removing the known data bits from the first coded data blocks to generate the second coded data blocks, the second coded data blocks satisfying a second code rate different from the first code rate; and

modulating the second coded data blocks using a modulation scheme to generate the modulated signal, wherein

a number of the at least one known information data bits depends on a number of the information data bits such that the first code rate is fixed regardless of the number of the information data bits.

6. The reception method according to claim 5 , wherein the known information data bits are zeroed bit.